Variable event stream (for DFG OSR exit) should be explicit about where on the stack a SetLocal put a value
https://bugs.webkit.org/show_bug.cgi?id=122178

Reviewed by Geoffrey Garen.
        
Now if the DFG stores the value of a variable into the stack explicitly via a SetLocal,
it will record where on the stack it stored the value in addition to recording where on
the stack the bytecode would have done the SetLocal. Previously it just recorded the
format and the bytecode variable. Recording just the bytecode variable is currently fine
since the DFG always executes SetLocal's to the same stack location that the bytecode
would have used. But that prevents stack compression (webkit.org/b/122024) so this patch
allows the SetLocal to say both the bytecode variable that we're speaking of and the
actual stack location to which the SetLocal stored the value.
        
This had to touch a lot of code, so I took the opportunity to also resolve
webkit.org/b/108019.

* bytecode/Operands.h:
(JSC::Operands::hasOperand):
* dfg/DFGFlushFormat.h:
(JSC::DFG::dataFormatFor):
* dfg/DFGMinifiedID.h:
(JSC::DFG::MinifiedID::bits):
(JSC::DFG::MinifiedID::invalidID):
(JSC::DFG::MinifiedID::otherInvalidID):
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileMovHint):
(JSC::DFG::SpeculativeJIT::compileInlineStart):
(JSC::DFG::SpeculativeJIT::compileCurrentBlock):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::recordSetLocal):
* dfg/DFGSpeculativeJIT32_64.cpp:
(JSC::DFG::SpeculativeJIT::compile):
* dfg/DFGSpeculativeJIT64.cpp:
(JSC::DFG::SpeculativeJIT::compile):
* dfg/DFGValueSource.cpp:
(JSC::DFG::ValueSource::dump):
* dfg/DFGValueSource.h:
(JSC::DFG::ValueSource::ValueSource):
(JSC::DFG::ValueSource::forFlushFormat):
(JSC::DFG::ValueSource::forDataFormat):
(JSC::DFG::ValueSource::isSet):
(JSC::DFG::ValueSource::kind):
(JSC::DFG::ValueSource::valueRecovery):
(JSC::DFG::ValueSource::id):
(JSC::DFG::ValueSource::virtualRegister):
* dfg/DFGVariableEvent.cpp:
(JSC::DFG::VariableEvent::dump):
(JSC::DFG::VariableEvent::dumpSpillInfo):
* dfg/DFGVariableEvent.h:
(JSC::DFG::VariableEvent::fillGPR):
(JSC::DFG::VariableEvent::fillPair):
(JSC::DFG::VariableEvent::fillFPR):
(JSC::DFG::VariableEvent::spill):
(JSC::DFG::VariableEvent::death):
(JSC::DFG::VariableEvent::setLocal):
(JSC::DFG::VariableEvent::movHint):
(JSC::DFG::VariableEvent::id):
(JSC::DFG::VariableEvent::gpr):
(JSC::DFG::VariableEvent::tagGPR):
(JSC::DFG::VariableEvent::payloadGPR):
(JSC::DFG::VariableEvent::fpr):
(JSC::DFG::VariableEvent::spillRegister):
(JSC::DFG::VariableEvent::bytecodeRegister):
(JSC::DFG::VariableEvent::machineRegister):
(JSC::DFG::VariableEvent::variableRepresentation):
* dfg/DFGVariableEventStream.cpp:
(JSC::DFG::VariableEventStream::reconstruct):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@156747 268f45cc-cd09-0410-ab3c-d52691b4dbfc